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通过加入稀土金属(Ce),研究不同稀土含量对变质夹杂物的影响。发现在洁净度较高的A l脱氧特殊钢中稀土能够使氧化铝、硫化锰夹杂变质并能形成硬度较低的铝酸稀土夹杂物。研究结果表明:当稀土含量Ce<15 ppm时,钢中没有稀土夹杂物;当15 ppm≤Ce≤140 ppm时,能够生成稀土铝氧化物和稀土硫氧化物夹杂物;当Ce>140 ppm时,夹杂物进一步转变为稀土铝氧化物和稀土氧硫化物的复合夹杂物,并有部分稀土氧硫化物和稀土硫化物,夹杂物的尺寸也随着增大。热力学分析计算表明:在[O],[S]含量较低的前提下,Ce变质A l2O3所需的条件是aCe.aA-l1=0.145,当[A l%]=0.01~0.03时,对应溶解的稀土含量[Ce]=22~67 ppm。
By adding rare earth metal (Ce), study the influence of different rare earth content on the metamorphic inclusions. It is found that rare earths in Al l deoxidation special steel with high cleanliness can make inclusions of aluminum oxide and manganese sulfide inclusions and form rare earth aluminate rare earth inclusions with lower hardness. The results show that there is no rare earth inclusion in the steel when the content of rare earth Ce is less than 15 ppm, rare earth aluminum oxide and rare earth sulfur oxide inclusions are formed when 15 ppm ≤ Ce ≤ 140 ppm, , The inclusions further transformed into composite inclusions of rare earth aluminum oxides and rare earth oxysulfides, and some rare earth oxysulfides and rare earth sulfides also increased in size. Thermodynamic analysis shows that under the condition of low [O] and [S] content, the required conditions for the metamorphic Al 2 O 3 of Ce are aCe.aA-l1 = 0.145. When [A l%] = 0.01 ~ 0.03, The dissolved rare earth content [Ce] = 22-67 ppm.